TASK 72-42-33-300-024 No. 4 Bearing Front Seal Support - Restore The Front Flange Inner Diameter, Repair-024 (VRS3796)

DMC:V2500-A0-72-42-3301-01A-970A-C|Issue No:003.00|Issue Date:2021-02-01

Export Control

EAR Export Classification: Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3), except for the following Service Bulletins which are currently published as EAR Export Classification 9E991: SBE70-0992, SBE72-0483, SBE72-0580, SBE72-0588, SBE72-0640, SBE73-0209, SBE80-0024 and SBE80-0025.

Copyright

© IAE International Aero Engines AG (2001, 2014 - 2021) The information contained in this document is the property of © IAE International Aero Engines AG and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of © IAE International Aero Engines AG. (This does not preclude use by engine and aircraft operators for normal instructional, maintenance or overhaul purposes.).

Applicability

All

Common Information

TASK 72-42-33-300-024 No. 4 Bearing Front Seal Support - Restore The Front Flange Inner Diameter, Repair-024 (VRS3796)

Effectivity

FIG/ITEM PART No.

01-020

2A0851

01-020

2A2833

01-020

2A3537

01-020

2A3845

01-020

2A4323

Material of component

PART IDENT

SYMBOL

MATERIAL

No. 4 bearing seal support assembly

-

PWA 1264 Titanium alloy

General

None

Preliminary Requirements

Pre-Conditions

Action/ConditionData Module/Technical Publication
Make sure that all the cleaning and inspection procedures are done before this repair.

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Workshop inspection equipmentLOCALWorkshop inspection equipment
Magnifying Glass, 4xLOCALMagnifying Glass, 4x

or greater

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-42-33-320-075 Machine the Front Flange Inner Diameter of the No. 4 Bearing Seal Support Assembly Before Coat

    1. Refer to Figure and Figure.

      2. Remove the coating from the inner diameter of the seal support assembly.

      1. Refer to SPM TASK 70-32-07-100-501.

      3. Remove the wear on the inner diameter of the seal support assembly.

      1. Refer to SPM TASK 70-32-06-320-501.

    2. SUBTASK 72-42-33-110-089 Clean the No. 4 Bearing Seal Support Assembly

      1. Clean the seal support assembly.

      1. Refer to SPM TASK 70-11-03-300-503.

    3. SUBTASK 72-42-33-230-057 Examine the No. 4 Bearing Seal Support Assembly

    1. Refer to Figure and Figure.

      2. Do a fluorescent penetrant inspection of the seal support assembly repair area by TASK 72-42-33-200-000 and applicable part number.

      1. No cracks are permitted.

    3. Do a dimensional inspection of the part.

    4. SUBTASK 72-42-33-340-001 Restore the Front Flange Inner Diameter of the No. 4 Bearing Seal Support Assembly by Coat

    1. Refer to Figure and Figure.

      2. Prepare the part for coat.

      1. Refer to SPM TASK 70-34-18-380-501.

      2. Mask areas not to be coated.

      3. Grit blast out of the area shown is not permitted. Apply a mask or maskants.

      3. Coat the inner diameter of the seal support assembly front flange.

      1. Apply IAE 36206-4 HVOF coat or IAE 271-13 coat to the repair areas. Unless given differently, coat out of the area shown is not permitted. Coat to a sufficient thickness for finish machine dimensions. Apply a mask or maskants.

    5. SUBTASK 72-42-33-110-090 Clean the No. 4 Bearing Seal Support Assembly

      1. Clean the seal support assembly.

      1. After the coat is applied and the part is cool, remove the mask or maskants.

      2. Remove the remaining tape by SPM TASK 70-11-26-300-503.

    6. SUBTASK 72-42-33-320-076 Machine the Front Flange Inner Diameter of the No. 4 Bearing Seal Support Assembly

    1. Refer to Figure and Figure.

      2. Machine the inner diameter of the support after coat. Refer to SPM TASK 70-32-07-100-501.

      1. If the measured diameter in a free condition is not satisfactory, a held condition is permitted.

        All dimensions are applicable when Surface AB is flat to a maximum of 0.002 in. (0.05 mm), Diameter AC keeps a clearance envelope of 10.887 in. (276.530 mm) and Diameter AD keeps a clearance envelope of 6.050 in. (153.67 mm) in a free or held condition.

        Hold the seal support assembly only on Surface AB and AE and Diameters AC and AD.

        NOTE

        The thickness of the coat after finish machine must be 0.003 in. to 0.020 in. (0.08 mm to 0.51 mm) all around.

    7. SUBTASK 72-42-33-110-091 Clean the No. 4 Bearing Seal Support Assembly

      1. Clean the seal support assembly.

      1. Clean the part.

        Refer to SPM TASK 70-11-03-300-503.

    8. SUBTASK 72-42-33-220-112 Examine the Repair

    1. Refer to Figure and Figure.

      2. Examine the seal support assembly after coat and finish machine operation.

      1. Refer to TASK 72-42-33-200-000 (INSPECTION-000).

        Use a 4X (or more) magnifying glass to do a visual inspection of the coated area to examine for cracks and adhesion.

    9. SUBTASK 72-42-33-350-085 Identify the Repair

      1. Mark VRS3796 on the repaired No. 4 bearing seal support adjacent to the part number.

      1. Make a permanent mark by the procedure given in SPM TASK 70-09-00-400-501. Remove high material caused by marking the number.

    10. Figure: Repair Details and Dimensions

    Sheet 1

    Legend
    Repair Details and Dimensions

    Sheet 1

    Close

    Figure: Repair Details and Dimensions

    Sheet 2

    Legend
    Repair Details and Dimensions

    Sheet 2

    Close

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised effectivity table, procedural steps and added prerequisites. (16VC287)

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:LOCAL
Tool Number:Magnifying Glass, 4x
Tool Name:Magnifying Glass, 4x
Manufacturer Code:LOCAL
Tool Number:Workshop inspection equipment
Tool Name:Workshop inspection equipment